> They had no reason to have such a report
Yes they did. Put it this way ... I don't have a Coutts account. If I wanted to have one, they would check whether I had the criteria and, having not meeting those criteria, they wouldn't allow me to open an account ... irrespective of my views and values.
Farage had an account, because he once met the criteria. Recently he failed to continue meeting the criteria. So they were in their rights to figure out whether they would continue to keep an account for him. And they chose not. Their choice. It's the equivalent of wearing trainers into the golf club - some are happy, others not.
Coutts didn't publish anything nasty about Farage. They made a value judgment, and made an internal report based on their judgment. Farage then pulled a SAR (subject access request), and then published it. Any damage reputation of Farage is therefore of his own making. Loads of people are refused a bank account, as is the bank's right, and it has no reflection of their personality.